Cross-site scripting in Microsoft SharePoint Server - CVE-2026-55016
Published: July 17, 2026
Vulnerability identifier: #VU138274
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-55016
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform spoofing.
The vulnerability exists due to improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint when handling malicious web content over the network. A remote user can send a malicious link and convince the user to open it to perform spoofing.
User interaction is required to open a malicious link.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-55016
Install security update from vendor's website.
Microsoft SharePoint Server - addressed in versions 16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434